Electrode for arc-lamps.



G. M. DYOTT.

ELECTRODE FOR ARC LAMPS. APPLICATION FILED APR.28,1906.

956,51 9-. Patented May 3,1910.

WITNESSES: I 'iNVENTOR jijy a z ((2% 6.15%

r TED SITES ATENT OFFICE.

GEORGE i. pYoTT; or rITTsBUne, PEN'NsYLVANIA, ASSIGIN'OR To WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A conPonATIoN or PENNSYLVANIA.

ELECTRODE FOR ARC-LAMPS.

To all whom it may concern: bination 'will be higher than that of iron Be it known that I, GEORGE M. DYOTT, a I alone and which w ll therefore steady the subject of the King of Great Britain, and a arc and render the electrode less readily resident 'of Pittsburg, in the county of Alledestructible. By the use of suitable sub-- gheny and State of Pennsylvania, hav instances, desired and appropriate .color charrented a new and useful Improvement in acteristics mayalso be imparted to the arc. Electrodes forArc-Lamps, of which the fol- The single figure of the accompanying lowingis a specification. drawing illustrates theelectrodes of an arc My invention relates to are lamps and lamp that'embodies my invention. particularly to those in whichthe electrodes The negative electrode 1 of the lamp is 5 are composed of materials which render the preferably composed, as before describe of arc flaming or luminous 1 the magnetic oxid of iron and the oxids of The object of my invention is to provide titanium and chromium though it may also an electrode for lamps of the character inbe composed of other substances having CllGZLtQCl -WhlCh shall not be readily con-- similar or suitable properties. The upper sumed and which shall insure the production electrode or anode 2 comprises a block of of a steady, uniform light of good quality. iron having the end which is presented to Arc lamps are now frequentlyprovided the other electrode, drilled or slotted so as with electrodes, the compositions of which to provide holes or recesses in which other are such that the arcs are rendered more materials may be placed. Such other ma- 75 luminous than those produced by the orditerials as have been found suitable and prefnary carbon electrodes and alsov such that erable are titanium oxid, chromous oxid, they are very much less rapidly consumed. manganese di-oxid or a mixture of two or An electrode of this character which has more of these oxids with each other or with been found suitable in practice has been iron oxid, though other substances may also so composed of a mixture of the magnetic oxid be employed. The oxids of titanium, chroof iron, which is a conductor whether hot or mium and manganese have higher fusing cold, and which gives conductivity to the points than iron and serve to revent rapid electrode, the oxid of titanium which imconsumption of the electrodii. Titanium parts appropriate color and brilliancy to oxid may also impart desirable color charac- 35 the arc, and the oxid of chromium which teristics to the arc. The oxid of iron being steadies the arc and prevents the electrodes a conductor, the slag which forms upon the from being rapidly consumed, these subend of the anode, when in use, will not prestances being combined in varying and suitvent ready. starting of the lamp after it has able proportions. Other compositions of been in use fora time. It has also been these materials or of others having similar found that globules of molten metal adhere or suitable properties may alsolbe employed. less readily to an anode that is constructed Such an electrode has heretofore been emas described than to one which is composedployed as the cathode usually in combin'aof copper. The recesses orholes in the election with a copper positiveyelectrode. It trode may also be filled with metals instead has been found, under certain conditions, of the oxids of metals, if desired, chromium, however, that lobules of slag form on the titanium and manganese having been found copper electrode containing a considerable useful, though other metals having h' her amount of copper oxid, which is an insulatfusing points than iron or other meta of ing material, when cold, and which fre-- which the body of the electrode is composed 10o quently prevents the arc fromstarting after may be employed. the lamp has been in use. For this reason The electrode may be constructed in any it has been proposed to employ iron, silver other suitable manner than that shown, and or some other metal, the oxid of which is a if desired, may be composed of alloys 0 conductor. Iron, however, is more readily two or more of the metals specified. v V consumed than copper and causes the are I claim as my invention: I to become very unsteady. According to the 1. An electrode comprising a block of iron. present invention I propose to combine with having a plurality of end recesses and'titanic 1 iron another substance or substances of such material contained within the recesses. character that the fusing point of the com- 2. An electrode comprising a block of Application filed April 28, 1906. Serial No. 314,213.

Patented May a, 1910. u

metal having a low fusing point, said block In testimony whereof, I have hereunto having a plurality of recessw, and material subscribed my name this 13th day of April 10 having la; higher fusing point contained 1906. wit in t e recesses.

3. An electrode comprising a block v0i. iron GEORGE DYOTT having a plurality of end recesses and the Witnesses: oxid. of a metal having a higher fusing O'rro S. SGHAIRER, point contained within the recesses. 1 Emmy HINES. 

